The king Dmitar Zvonimir handed over St. Grgur's monastery on Vrana lake to the pope as a hospice. According to the transcript of the oath of Dmitar Zvonimir, there were two golden crowns with jewells. Starting from the assumption, those were the crowns of the kings Tomislav and Stjepan Držislav of whom the legends have been told among the croats.
The first time Pirovac was mentioned as a Sloslein/Slosell is connected with the time of the Crusades when there was a strong foothold of the knights templars on the Lake Vrana near Pirovac. Thousands and thousands of adventurer knights came here from all over the Europe through their journey to the Holy land.